.travis.yml in akero-1.0.4 vs .travis.yml in akero-1.1.0

@@ -1,9 +1,5 @@
 language: ruby
+before_install:
+  - gem install bundler
 rvm:
-  - "1.8.7"
-  - "1.9.2"
-  - "1.9.3"
-#  - jruby-18mode # JRuby in 1.8 mode
-#  - jruby-19mode # JRuby in 1.9 mode
-  - rbx-18mode
-  - rbx-19mode
+  - "2.3.1"